EP1330345A1 - Procede de traitement d'un polycondensat dans une extrudeuse a vis multiples - Google Patents

Procede de traitement d'un polycondensat dans une extrudeuse a vis multiples

Info

Publication number
EP1330345A1
EP1330345A1 EP01944859A EP01944859A EP1330345A1 EP 1330345 A1 EP1330345 A1 EP 1330345A1 EP 01944859 A EP01944859 A EP 01944859A EP 01944859 A EP01944859 A EP 01944859A EP 1330345 A1 EP1330345 A1 EP 1330345A1
Authority
EP
European Patent Office
Prior art keywords
polycondensate
extruder
melt
seconds
melting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01944859A
Other languages
German (de)
English (en)
Other versions
EP1330345B1 (fr
Inventor
Federico Innerebner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Christel Andreas
Schweikle Juergen
Buehler AG
Original Assignee
Christel Andreas
Schweikle Juergen
Buehler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Christel Andreas, Schweikle Juergen, Buehler AG filed Critical Christel Andreas
Publication of EP1330345A1 publication Critical patent/EP1330345A1/fr
Application granted granted Critical
Publication of EP1330345B1 publication Critical patent/EP1330345B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/435—Sub-screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/69—Filters or screens for the moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
    • B29C48/766—Venting, drying means; Degassing means in the extruder apparatus in screw extruders
    • B29C48/767—Venting, drying means; Degassing means in the extruder apparatus in screw extruders through a degassing opening of a barrel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/425—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders using three or more screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/425—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders using three or more screws
    • B29C48/43—Ring extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/26—Scrap or recycled material

Definitions

  • the invention relates to a process for processing a polycondensate, in particular polyethylene terephthalate (PET), into granules consisting of pellets, the polycondensate being melted in the course of the process and later solidified again.
  • PET polyethylene terephthalate
  • the PET starting material comes directly from PET synthesis, or PET bottle recyclate (RPET) is used, with the RPET portion coming from the bottle wall being preferred, so that one works primarily with chips or flakes.
  • these chips always contain small amounts of water, which on the one hand can be residual water from the bottle washing process that has not been expelled and / or newly penetrated water during the storage and transportation of the chips. If these chips from RPET or new PET with their water content are melted in the extruder to produce granules, the condensation reaction predominantly takes place in the opposite direction (establishment of equilibrium) and the hydrolysis predominates, so that the average chain length, i.e.
  • the degree of polymerization decrease, as a result of which the viscosity (indicated as viscosity number or intrinsic viscosity (IV)) of the polymer decreases.
  • This hydrolytic degradation is more pronounced the more water and the more time is available for the degradation reaction.
  • the invention is therefore based on the object of designing the prior art method in such a way that, with only partial predrying, there is no greater IV reduction than in the prior art.
  • the method according to claim 1 By limiting the time during which the polycondensate to be processed is in the melt and is at or above the melting temperature or less than 60 seconds, the polycondensate no longer has enough time to react predominantly hydrolytically due to its relatively high water content.
  • the time-consuming and energy-intensive pre-drying can thus be dispensed with at least in part, and despite the relatively high water content in the starting polycondensate, significantly less hydrolysis occurs during processing in the melt state. For example, with PET or RPET the IV degradation can be kept at a small acceptable value even with a relatively high water content of around 600 ppm.
  • the total time during which the temperature of the polycondensate in the course of the method is above the melting temperature of the polycondensate is preferably kept below about 30 seconds.
  • polyethylene terephthalate PET
  • PET polyethylene terephthalate
  • the polycondensate can be present in its starting form as bulk material with a bulk density in the range from 200 kg / m 3 to 600 kg / m 3 , in particular in the form of flakes or chips, which is typically bottle recyclate (RPET).
  • RPET bottle recyclate
  • the polycondensate starting material is preferably partially pre-dried before melting. As a result, a combination of a less complex partial drying and the short residence time in the molten state can result in an end product with little IV degradation.
  • the method has a degassing step for removing volatile impurities and / or decomposition products from the polycondensate.
  • a twin-screw or multi-screw extruder in particular a ring extruder, is preferably used for melting the polycondensate.
  • the RingExtruder With the RingExtruder, the ratio between the surfaces on which the product to be processed is actively acted and the volume of the product to be processed is particularly large, so that with a given overall length, a higher degassing capacity and a narrower residence time spectrum and ultimately a shorter residence time than with conventional ones Twin screw extruders is achieved.
  • the polycondensate is preferably introduced into the extruder in the solid state, and the polycondensate is heated to a temperature below the melting point, the polycondensate being degassed and / or dried.
  • the degassing and / or drying of the polycondensate in the solid state takes place here at a pressure below atmospheric pressure and / or with the addition of an inert gas.
  • the method according to the invention is characterized in that the total time during which the polycondensate is present in the course of the method is from a first time period, during which the polycondensate is still in the extruder after melting in the extruder, and from a second time period , during which the still molten polycondensate outside of the extruder is processed, the first.
  • Time period is preferably less than about 15 seconds.
  • a residence time of the melt in the extruder of less than about 10 seconds is particularly advantageous.
  • Processing the molten polycondensate outside the extruder may include the melt filtration step to separate contaminant particles.
  • a melt pump is preferably used to build up the necessary pressure.
  • the melt pump and the melt filter must be integrated into the process in such a way that the short dwell time according to the invention is maintained.
  • FIG. 1 shows the permissible residence time of PET in the molten state for an IV breakdown from 0.81 to 0.76 as a function of the residual water content of the PET melt.
  • flakes flakes, schnitzel
  • an input IV value of 0.81 and 0.6% water content were subjected to partial predrying in a 30 mm ring extruder at 300 rpm and melted.
  • the melt was degassed and passed through a melt pump, a melt filter and an extrusion die and then immediately cooled.
  • the melt temperature was 285 ° C in each case.
  • the process was operated in such a way that a residence time in the melt of
  • the process was operated in such a way that there was a residence time in the melt of 43 seconds, which was achieved by a heated pipe between the melt filter and the nozzle.
  • the IV value of the granules was 0.69.
  • the residual water content after the melt degassing can be calculated from the calculated reaction kinetics, which is about 600 ppm for both tests. This also results in the maximum hydrolytic degradation with an (infinitely) long residence time, which corresponds to an IV degradation to 0.52.
  • FIG. 1 shows the permissible residence times at 285 ° C. melt temperature with partial predrying, which limit the IV breakdown to the value of 0.05 that is acceptable for many applications.
  • predrying to below 100 ppm must be attempted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Polyesters Or Polycarbonates (AREA)
EP01944859A 2000-11-02 2001-07-09 Procede de traitement d'un polycondensat dans une extrudeuse a vis multiples Expired - Lifetime EP1330345B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10054226A DE10054226A1 (de) 2000-11-02 2000-11-02 Verfahren zur Verarbeitung eines Polykondensats in einem Mehrwellen-Extruder
DE10054226 2000-11-02
PCT/CH2001/000429 WO2002036317A1 (fr) 2000-11-02 2001-07-09 Procede de traitement d'un polycondensat dans une extrudeuse a vis multiples

Publications (2)

Publication Number Publication Date
EP1330345A1 true EP1330345A1 (fr) 2003-07-30
EP1330345B1 EP1330345B1 (fr) 2005-02-16

Family

ID=7661839

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01944859A Expired - Lifetime EP1330345B1 (fr) 2000-11-02 2001-07-09 Procede de traitement d'un polycondensat dans une extrudeuse a vis multiples

Country Status (11)

Country Link
US (1) US6841656B2 (fr)
EP (1) EP1330345B1 (fr)
CN (1) CN100398289C (fr)
AT (1) ATE289249T1 (fr)
AU (1) AU2001267252A1 (fr)
DE (2) DE10054226A1 (fr)
ES (1) ES2236252T3 (fr)
MX (1) MXPA03001750A (fr)
PL (1) PL362125A1 (fr)
TR (1) TR200403374T3 (fr)
WO (1) WO2002036317A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10348425B4 (de) * 2003-10-14 2008-07-24 Bühler AG Verfahren zur Herstellung eines Profils aus einem Polykondensat
DE10357578A1 (de) * 2003-12-08 2005-07-14 Bühler AG Spritzgussanlage und Spritzgussverfahren
EP2025494A1 (fr) * 2007-08-10 2009-02-18 Motech GmbH Technology & Systems Procédé et dispositif de fabrication d'une bande d'emballage

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US3619145A (en) * 1969-11-28 1971-11-09 Mobil Oil Corp Apparatus for polymerizing liquids
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FR2439074A1 (fr) * 1978-10-18 1980-05-16 Rhone Poulenc Textile Procede de regeneration de polymere a partir de dechets
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US4797237A (en) * 1987-05-04 1989-01-10 Floyd V. Hammer Method for recycling a beverage container
NL8800904A (nl) * 1988-04-08 1989-11-01 Reko Bv Werkwijze voor het verwerken van een thermoplastisch polycondensatie-polymeer.
US5242993A (en) * 1989-09-05 1993-09-07 Bridgestone/Firestone, Inc. Reduction of acidity of polyesters by melt reaction endcapping with an alkylacetylacetonate
IT1245597B (it) * 1991-03-29 1994-09-29 M & G Ricerche Spa Processo per la produzione di resine poliestere ad elevato peso molecolare
JPH0542533A (ja) 1991-08-15 1993-02-23 Mitsubishi Petrochem Co Ltd 熱可塑性ポリエステルの混練加工方法
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EP0588008B1 (fr) * 1992-09-18 1997-04-16 HERMANN BERSTORFF Maschinenbau GmbH Dispositif pour dégazage, en particulier de matières thermoplastiques fondues
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EP0788867B1 (fr) * 1996-02-06 1999-07-07 Josef A. Blach Dispositif de traitement continue des matières liquides
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See references of WO0236317A1 *

Also Published As

Publication number Publication date
ATE289249T1 (de) 2005-03-15
MXPA03001750A (es) 2005-11-04
ES2236252T3 (es) 2005-07-16
CN1473100A (zh) 2004-02-04
PL362125A1 (en) 2004-10-18
AU2001267252A1 (en) 2002-05-15
EP1330345B1 (fr) 2005-02-16
US6841656B2 (en) 2005-01-11
TR200403374T3 (tr) 2005-02-21
DE50105383D1 (de) 2005-03-24
DE10054226A1 (de) 2002-05-08
WO2002036317A1 (fr) 2002-05-10
US20040006195A1 (en) 2004-01-08
CN100398289C (zh) 2008-07-02

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